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i (No Moden) sheets-smet 2. T. A. WESTON.

HOISTING MBGHANISM.

' No. 41s,oo4.- Patented ont. 15, 1889.

' NvENToR By his www Thomas Wston 'wlTNEssEs (No Model.) 4 sheetssheet4.

T. A. WESTON. HOISTING MBGHANISM.

No. 413,004. Patented Oct. 15, 188.9.

Thomas veston .By hsttomeys UNTTen S'TnTns PnTnNT Y THOMAS A. WESTON,A0F lAMlfORD, CONNEC' 1(U'l", ASSGNOR TO THE YALE da TOVNE MANUFACTURINGCOlliPNY, OF SAME PLAGE.

" HESTNG MECHANESM.

SPECFICATION forming part of Letters Patent No. 413,004, dated @Ctober15,1889,

Application filed October 105 1887. vSerial No. 251,953. (No model.)

To all whom it may concern;

Be it known that I, THOMAS A. "WESTON, of

Stamford, iu the county of Fairfield and State of Connecticut, haveinvented certain new and usefnl improvements in l'loisting Mech--anisms, of which the following is a. specification.

My invention relates, primarily, to portable and fixed hoists employinga type of gearing known to mechanics as sun-and-planet gearing, someVfeatures of my invention being` more genera' ly applicable, as willappear hereinafter. Prominent features my invention are- First. Aspecial arrangement of the n1echanism and framework of the hoist,wherein the main lifting-shea'vo is placed within the machine betweenthe two frame sides and upon a hollow shaft, the driving-pulley exteriorto the frame on one side of the machine, anda system oi'sui1-ancl-planet rearing ente rior to the frame on the other side of thema chine. l thus obtain a compact andsymrnetrical construction o'f asni. andplanet-geared hoist having the minimum of friction with theload-chain and suspension-hook very nearly in the vertical central lineof the maof a hoistembodying chine.

Second. A11 independent cam and roller check-wheel to check the backwardmotion of the machine, the said check-wheel being,` a separate piece'not integral with any other and therefore easily renewable by itself,and so applied to one of the two parts between which the check action isdesired that the excessive radial strains of the cam -faces and rollersare wholly avoided, being self-contained within the body of the saidpart, and thus kept from distorting the machine'in which the device isincorporated and from frictionally impeding its free motion.

Third. A peculiar yoke or hanger whereby 4the machine is suspended orsupported, the

pivotal motion of which yoke, caused by its -oblique position in regardto the entire ,loadstrain upon it, serves to operate a frictionbrake tosustainthe load.

I am aware that heretofore there have been 5o mang7 prior inventions ordevices having obside E.

a plan, the neclof the siis1'ie1isi'o1i-hookbeingv Fig, 2 is anelevation ofthe shown in section. outerand geared side of the machine,showing the suspension-hook as broken away. Fig. 3 is an elevati ci theother outer side, haird ing the drivi `A;-puliey broken away partly toexpose thecam check-wheel and rollers, and the suspension-hook brokenaway. l is a vertical section Vwith the suspension hook shown as brokenaway..

A. is the tocthedliftii'xg-sheave, attached to thehollow main shaft l."lhc sheavc A has its periphery formed to engage with the links of aliftinggchain having; at its lifting cndthe usual hook. The shaft B iscarried by bearings in the framesides l) and ll.

C is the driving-sheave, loperated by the usual endless hand-chain, andit is keyed to the shaft C', the latter turning within the shaft E. Theshaft C carri 3s a pinion Cthe latter engaged with the equalplanet-pinions B4, which tnrn onpivots B3, carried by and revolving'with the flange l of the hollow shaft. To the iiange l is attached aring or frame B2 to support the outer ends of the pivots 153. Thepinions i34 also engage with the fixed annular wheel D", forming part ofthe frame side D. The two frame sides D andE are' united by three studsF h" Fi, only one of which F" is shown in Figs. 3 and andthe other twoare shown in Fig. l, the stud F forn'iing the pivot of the yoke G. Theyoke G has an ordinary hooi; G and a side horn To the horn G? isattached one end of the brake-strap li, the other end being se cured tothe horn lfl, cast upon the frame rl`he frame side E, by a central bossor bearing' E2 on its outer side, supports a brake-pulley i, embraced bythe strap ll. lVithin' the pulley l', in an annular recess l', is placedthe cheek-wheel Il, having its pe- IOO fined to its own cam-surface byprojections K. The latter carry the rollers around with the rotations ofthe check-wheel K one way within the annular recess I of the pulley I.The contrary motion -of the check-wheel K within the recess I isprevented by the wedging action ofthe rollers between the rocam-surfaces K and the opposite inner annular rim of the recess I.l Thecheck-wheel K has on its side a horn orflug K4, embraced by aslightly-larger opening in the driving-pulley C, whereby the said partsC and K are loosely engaged or clutched to each other, so

as to rotate or to be at rest together. The said cam and roller checkingdevice is old in its main features. It is shown in a somewhat improvedform as the subject of claim No. 7

2o in the specification of my United States Patent No. 333,906, January5, 1886, and in this my-present invention -I have further andsubstantially improved it by making the checklwheel K a separate pieceby itself, not inte- 2 5 gral with any adjacent piece, but placed withinan annular recess I in thexp'ulley I, sothat all its severe radialstrains from its cam action on the rollers are received upon andvconfined vbetween two opposing concentric walls 3o of the recess I inthe body of the pulley L In all former constructions of 'this device itssevere strains take full "effect upon the bearings to which' it isapplied, tending to separate the said parts from each other and causingexcessive journal-friction.` The sepaxrate casting K, .with its rollers,furnishes a pawl or check device between the pieces C and I. It isintegral with neither, but is loosely clutched with the sheave (l andintermittently fao connected with the pulley I by the slipping and camaction of its cam-surfaces and rollers.`

The' check-wheel K, exposed to the severe indenting action of therollers on its cam-surfaces, is by this my construction easily renewablewhen worn Awithout replacing therewith any adjacent part, and 4itscam-strains cannot pass beyond the annular recess containing it.l

The yoke G, pivoted upon the stud F, is held 5o' thereon obliquely tothe strain-line ofthe load by its attachment to the strap II. Thetendency of the yoke Gto straighten into the line of the load-strainthereon tightens the strap H around the pulley Iwith varying force asthe-load varies.. The pulley Lthus frictionally grasped by the strap H,becomes an abutment to the check-wheel K and sheave C, thus affordingtheneedful check'or selfsustaining action'l against the backward moo tionof the hoist and the running down of the load when the operatorlets gothethandrchain/ upon the sheave- C. He can lower the load, however, bydriving the sheave C backward, and with ,it the brake-pulley I, againstthe 65 frictionalresistance of the strap H.

' The hoisting motion is as follows: Rotary motion being applied to thesheave C and shaft C,`its sun pinion C)2 causes the,

planet-pinions B fo roll around the fixed an- The pinions B4 thereforenot only rotate upon their own axes or pri-vets,

f but at the same time rotate around the main .center or axial lline ofthe shaft'C and its pinion C2. In the latter motion or orbit the pmionsBJg carry with themv the flange B', on 'which they are pivoted, thehollow shaft B,

the sheave A, and the chain thereoiilland thus lift a suspended load.The said hoisting motions are indicated by arrows upon the sevF veralparts in Figs. 2 and 3. The reverse fno-- tion, by continuallyoverhauling the hand- .chain','constitutes the slow or safety loweringmotion explained above. A rapidor ordinary brake-lowering action isprovided las follows: H3 is 'the brake-lever, pivotfed to the frame sideD. When not in use, the said lever folds across the frame side, as shownin Figs. 1 and 2.- For use'it is swung out radially, as shown by dotted'lines 'in Fig. l1'. Tol its outer end H4 a cord is attached, and by thesaid cord and lever the block or hoist can be swung bodily or turnedslightly upon the pivot F in the direction of the long curved arrow W,Figs. 2 and 3. The said movement'unwraps or slackensv the strap H fromthe pulley I, and thus theA load can be lowered at any desired speed.Upon -ceasing thus to defiect the block from its normal position theload-strain at.

once restores it thereto and automatically applies the brake, as alreadyexplained, the hoist and load being automatically self-sustaining alwayswhen left alone.

I claim as my invention- 1. The combination, with a hoistfram`e,'of l' adriving-sheave exterior to the frame on one side thereof, a train ofsun-and-planet gearing exterior to the frame on the other side thereof`and carried on the flanged extension of the hollow shaft, a drivin g-shaft upon which said sheave is fixed, and which gears with and givesvmotion to said train of gearing, a hollow shaft journaled in the twosides of the frame through which said drivingshaft passes, and the mainlifting-sheave carried on said hollow shaft, substantially as 'setvforth.

2. VThe combination, with a'hoist-fraihe provided With a train ofsun-and-planet gearing, of a mainlifting-sheave secured toa hollowrotatory main shaft, the latter j oui-naled at each end in the frame,and provided witha flange exterior to the hoist-frame and carrying theplanet-pinions, and within the said rotatory hollow main shaft adrivingvsxhaft, substantially as set forth. p

3. The combination, 'with a hoistframe, f

a purchase-gearing consisting of a drivingslieave'and its attachedshaft, the latter jurnaled within a hollow main shaft, a driving# `wheelintegral with the hoist-'frame and external thereto, the saidplanet-pinions pivoted j, to and driving a flange or disk integral withthe main hollow shaft, and the main hollow shaft journaled at eachendi'n the frame and attached to a main lifting-sheave, substan-` ytially as set forth.

4. In a portable hoist, the combination of.-

the hoist-framein two parts D E, connected together by studs, as shown,said part D being provided with the annular ange D, the lifting-sheave Abetween the 'two parts D E, the hollow shaft B, to which the sheaye isfixed, provided with the flange B', the pinions B* thereon, thedrivinglpinion C2 and its shaft C', brake-pulley I, check-wheel K androllers, brake-strap H, and yoke G, substantially as set forth.

5. In a portable hoist, the combination of the hoist-frame in two partsD E, connected together by studs, as shown,said part D being providedwith the annular flange D", the lifting-sheave A between thetwo parts DE,

-the hollow shaft B, to which the sheave is fixed, provided with thevflange B', the pinions B4 thereon, the driving-pinion C2 and its shaftC', driving-pulley C, brake-pulley I, check-wheel K and rollers,brake-strap Il, yoke Gr, and brake-releasing lever H3, substantially Vasset forth.

v6. In a portable hoist, thev combination, with pulleys between which acheck action is effected, of a separate cam check-wheel,which, 3

- with its rollers, occupies an annular groove in the body of one offthesaid pulleys and is loosely clutched to the other,'substantially`as setforth. j l

7. In aportable hoist, thev combination of 9. The combination, in ahoist embodied in a pulley-block fian1e,'of a strap-brake, and apivoted'yoke', which is attached tothe :Suspension-hook, whereby thebrake is operated 35 thel pulley' C with the brake-pulley Landby theweight of the hoist and of any load 5o thereon, and an operating-leverfor withdraw f ing the vbrake frein action, substantially' as setforth.v

In testimony whereof I have hereunto snb'- scribed iny naine.

A THOS, A; WESTON.

Witnesses:

SCH'UYLER M ennrm,

Gno. E. WHITE.

